I’m creating a report in php in which 6 html drop downs appear and

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Asked: June 1, 20262026-06-01T07:58:10+00:00 2026-06-01T07:58:10+00:00

I’m creating a report in php in which 6 html drop downs appear and

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I’m creating a report in php in which 6 html drop downs appear and prompt the user to enter the two dates in which they would like to see the data of the report. So for example the report goes as follows:

See data between: [month][day][year] and [month][day][year] (where the brackets signify a select tag)

Also in this report is a function which calculates the percentage increase or decrease from the previous day. So for example if the user does not select any date range, it’s simply data of the current day and the percentage is calculated as:

round(((($newDataPointCount - $yesterdayDataPointCount) / $yesterdayDataPointCount) * 100),2)

This is obviously very easy to calculate for only one day because I can tell it to query the SQL database with INTERVAL 1 DAY. But here is my question, how would I calculate the number of day intervals if the months change?

Everything would work great if the user stays within one month so it would be something like [March][20][2012] – [March][29][2012], and I can easily calculate the value is 9, but when it’s something like [February][27][2012] – [March][20][2012], how can I calculate the number of days in between?

Just to clarify any questions that may arise, I’m using PHP and MySQL and would prefer to stay within those bounds.